All my miners except BURST point to Nicehash which then points to Poloniex.  I have a loan bot churning payouts in the lending pools so idle cash earns interest when I don't need it.  Occasionally I withdraw from Polo and buy discounted gift cards on CashCash.  That action alone adds +10-20% profitability for the miners.  Plus they offer an additional 2% discount when paying with BTC.  I haven't had an issue that CashCash customer service couldn't solve quickly.

BURST payouts go to Poloniex where I flip it a few times a day for about +1.5% each time.  Bots don't watch BURST so it's a casual market.  Some of that BTC goes into the aforementioned lending cycle.